Ovicidal Effect of Selected Compounds on the Eggs of Anopheles albimanus1,2
Authors: MILLER, STEVE; MADDOCK, DARRELL R.
Source: Journal of Economic Entomology, Volume 63, Number 4, August 1970 , pp. 1151-1154(4)
Publisher: Entomological Society of America
Abstract:Effectiveness of selected compounds as ovicides was investigated under laboratory conditions against melanized and unmelanized eggs of Anopheles albimanus Wiedemann. In most cases, unmelanized eggs were more susceptible to the toxicants tested. Melanization was necessary for egg hatch. Conversion of tyrosine to dihydroxyphenylalanine (DOPA) by tyrosine hydroxylase is the slowest enzymatic step in the overall synthesis of melanin. Tropolone, which has been reported to be an inhibitor of this enzyme, was 10 times more effective against unmelanized eggs than against melanized eggs, thus suggesting inhibition of tyrosine hydroxylase.
Structural activity relationships were established. Ovicidal efficiency increased with increase in alkyl side chain on the phenolic and polyhydric phenolic moiety. Aromatic and alicyclic substituted phenols were the most effective compounds tested as ovicides. The most potent antioxidant found was butylated hydroxyanisole (a food additive). When exposure periods to selected ovicides were less than 16 hr, mortality decreased. There was no marked increase in ovicidal effect when concentrations of ovicides were increased with an exposure period of 4 hr. The data indicate that penetration of the chorion is dependent on molecular configuration of the ovicide.
Document Type: Research Article
Publication date: August 1970
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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